Well....
I've compiled the ubuntu package.
When I've launched qemu, I've got this :
*
*$ *qemu-system-x86_64 -hda debian.img -m 512
qemu: could not load PC BIOS 'bios.bin'
**
*I've checked the content of the *pc-bios* directory and no bios are
generated but I've got strange file like :
**.bin
*.dtb
openbios-*
*
I think that the *configure* interprets the *** as a base character...
Therefore, I've copied the content of*pc-bios* directory of 0.15.1 in
the *pc-bios* directory of 0.14.0
Finally, the bug of rate have disappeared !!
*Iperf* gave me a rate of 19mbit which is the desired rate.
Vincent
Le 05/12/2011 12:11, Stefan Hajnoczi a écrit :
> On Mon, Dec 5, 2011 at 10:45 AM, Vincent Autefage
> <address@hidden> wrote:
>> So we have another problem...
>> The thing is that the 0.14.0 (and all 0.14.0 rc) built from GIT has the
>> same problem.
>> However, the package 0.14.0 from Ubuntu does not has this bug...
> Okay, that's actually a good thing because the issue is now isolated
> to two similar builds: 0.14.0 from source and 0.14.0 from Ubuntu.
>
> Either there is an environmental difference in the build configuration
> or Ubuntu has applied patches on top of vanilla 0.14.0.
>
> I think the next step is to grab the Ubuntu 0.14.0 source package and
> rebuild it to confirm that it does *not* have the bug.
>
> Then it's just a matter of figuring out what the difference is by a
> (manual) bisection.
>
> Are you using qemu-kvm? I found Ubuntu's 0.14.0-based package here:
>http://packages.ubuntu.com/natty/qemu-kvm
>
> Stefan
>
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You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/899140
Title:
Problem with Linux Kernel Traffic Control
Status in QEMU:
New
Bug description:
Hi,
The last main versions of QEMU (0.14.1, 0.15 and 1.0) have an important
problem when running on a Linux distribution which running itself a Traffic
Control (TC) instance.
Indeed, when TC is configured with a Token Bucket Filter (TBF) with a
particular rate, the effective rate is very slower than the desired one.
For instance, lets consider the following configuration :
# tc qdisc add dev eth0 root tbf rate 20mbit burst 20k latency 50ms
The effective rate will be about 100kbit/s ! (verified with iperf)
I've encountered this problem on versions 0.14.1, 0.15 and 1.0 but not with
the 0.14.0...
In the 0.14.0, we have a rate of 19.2 mbit/s which is quiet normal.
I've done the experimentation on several hosts :
- Debian 32bit core i7, 4GB RAM
- Debian 64bit core i7, 8GB RAM
- 3 different high performance servers : Ubuntu 64 bits, 48 AMD Opteron,
128GB of RAM
The problem is always the same... The problem is also seen with a
Class Based Queuing (CBQ) in TC.
Thanks
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